Where did my prepaid voucher surplus money go?

[toledano]

Recently I bought a Fido voucher of $50 dollars in order to pay my monthy fee of  $39. However the surplus amount did not show up on my airtime balance. Where did that money go? I would appreciate if someone could explain. Thanks

[FidoStephane]

Hi there toledano. 

So if I understand correctly, you refilled your account with $50, subscribed to the $39 prepaid plan, and your remaining balance was $0.00?